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Microsoft Security Bulletin (MS00-075)

- --------------------------------------



Patch Available for "Microsoft VM ActiveX Component" Vulnerability

Originally posted: October 12, 2000



Summary

=======

Microsoft has released a patch that eliminates a security

vulnerability in Microsoft(r) virtual machine (Microsoft VM). If a

malicious web site operator were able to coax a user into visiting

his site, the vulnerability could allow him to take any desired

action on a visiting user's machine.



Frequently asked questions regarding this vulnerability and the patch

can be found at

http://www.microsoft.com/technet/security/bulletin/fq00-075.asp



Issue

=====

The Microsoft VM is a virtual machine for the Win32(r) operating

environment. It runs atop Microsoft(r) Windows 95, 98, Windows Me,

Windows NT 4.0, or Windows 2000. It ships as part of each operating

system, and also as part of Microsoft Internet Explorer. The version

of the Microsoft VM that ships with Microsoft Internet Explorer 4.x

and Internet Explorer 5.x contains a security vulnerability that

could allow a Java applet, on a malicious web site to take any

desired action on a visiting user's machine.



The Microsoft virtual machine (Microsoft VM) contains functionality

that allows ActiveX controls to be created and manipulated by Java

applications or applets. This functionality is intended to only be

available to stand-alone Java applications or digitally signed

applets. However, this vulnerability allows ActiveX controls to be

created and used from a web page, or from within a HTML based e-mail

message, without requiring a signed applet. If a user visited a

malicious web site that exploited this vulnerability, a Java applet

on one of the web pages could run any desired ActiveX control, even

ones that are marked as unsafe for scripting. This would enable the

malicious web site operator to take any desired action on the user's

machine.



Web sites placed within the Restricted Sites zone in Internet

Explorer will not be able to exploit this vulnerability.



Affected Software Versions

==========================

Versions of the Microsoft VM are identified by build numbers, which

can be determined using the JVIEW tool, as discussed in the FAQ. The

following builds of the Microsoft VM are affected:



 - All builds in the 2000 series.

 - All builds in the 3100 series.

 - All builds in the 3200 series.

 - All builds in the 3300 series.



Patch Availability

==================

 - 2000-series Microsoft VM customers will be provided with an update

   soon.

 - 3100-series Microsoft VM customers upgrade to build 3318 or later

   from:

   http://www.microsoft.com/java/vm/dl_vm40.htm

 - 3200-series Microsoft VM customers upgrade to build 3318 or later

   from:

   http://www.microsoft.com/java/vm/dl_vm40.htm

 - 3300-series Microsoft VM customers upgrade to build 3318 or later

   from:

   http://www.microsoft.com/java/vm/dl_vm40.htm



This fix supersedes the patch supplied in MS00-059



Note Additional security patches are available at the Microsoft

Download Center



More Information

================

Please see the following references for more information related to

this issue.



 - Frequently Asked Questions: Microsoft Security Bulletin MS00-75,

   http://www.microsoft.com/technet/security/bulletin/fq00-075.asp

 - Microsoft Knowledge Base (KB) article Q275609,

   http://www.microsoft.com/technet/support/kb.asp?ID=275609

discusses

   this issue in more detail.

 - Microsoft TechNet Security web site,

   http://www.microsoft.com/technet/security/default.asp



Obtaining Support on this Issue

===============================

This is a fully supported patch. Information on contacting Microsoft

Product Support Services is available at

http://support.microsoft.com/support/contact/default.asp.



Revisions

=========

 - October 12, 2000: Bulletin Created.



- ------------------------------------------------------------------



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THE FOREGOING LIMITATION MAY NOT APPLY.



Last Updated October 12, 2000

(c) 2000 Microsoft Corporation. All rights reserved. Terms of use.



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